⚒️[FEATURE] Support for MySQL for SQLDBChain

[HenryHengZJ]

Describe the feature you'd like

Add Support for MySQL in SQLDBChain Docs: https://js.langchain.com/docs/modules/chains/other_chains/sql

✅Tasks

• [ ] Add MySQL support in existing SQLDBChain codebase

🎯Acceptance Criteria

• [ ] SQLDBChain can supports sqlite and mysql

👨‍💻How to contribute

Follow this guide for step by step on how to fork, commit, and submit PR.

👨‍💻Reference code

• SQLDBChain

More info

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